CSS pour Forum sur deux colonnes

/* MISE EN FORME DES CATEGORIES ET FORUMS */

.cate_titre
{
  clear: both;
  height: 100px;
  margin-top: 50px;
}
.catetitre_content
{
position: absolute;
z-index: 2;
display: block;
width: 950px;
margin-left: auto;
  margin-right: auto;
  margin-top: 0px;
text-align: center;
padding: 2px;
}
.catetitre
{
color: #8CC6D7;
font-family: Georgia;
font-size: 60px;
font-weight: bold;
letter-spacing: 1px;
text-shadow: 1px 1px 0px #000000;
}

.forum
{
float: left;
width: 460px;
height: 250px;
margin-left: 5px;
margin-right: 5px;
margin-bottom: 50px;
}
a.forumlink
{
  position: relative;
  z-index: 2;
  display: block;
  width: 100%;
  color: #454545;
  text-align: center;
font-family: Georgia;
font-size: 32px;
font-weight: bold;
letter-spacing: 1px;
text-shadow: 1px 1px 0px #000000;
    transform: all;
-moz-transform: all;
-o-transform: all;
-htm-transform: all;
-webkit-transform: all;
transition: 1s;
-moz-transition: 1s;
-o-transition: 1s;
-htm-transition: 1s;
-webkit-transition: 1s;
}
a.forumlink:hover
{
  letter-spacing: 4px;
    transform: all;
-moz-transform: all;
-o-transform: all;
-htm-transform: all;
-webkit-transform: all;
transition: 1s;
-moz-transition: 1s;
-o-transition: 1s;
-htm-transition: 1s;
-webkit-transition: 1s;
}
.forum_contenu
{
  position: relative;
  z-index: 1;
  width: 98%;
  height: 90%;
  padding: 2px;
  margin-left: auto;
  margin-right: auto;
  margin-top: -8px;
  background-image: url(http://www.marmistone.com/wp-content/files_mf/cache/th_c1298f73aff7b37d937a44ba578d6921_1294859169SUNNYOROLIGHT.jpg);
  border-left: 1px dotted #191817;
  border-right: 1px dotted #191817;
  border-bottom: 1px dotted #191817;
  border-top: 5px solid #191817;
}
.description
{
  display: block;
  width: 400px;
  margin: auto;
  height: 100px;
  overflow: hidden;
  border: 2px solid #9c9c9c;
  box-shadow: 1px 1px 1px #191817;
  -moz-box-shadow: 1px 1px 1px #191817;
  -htm-box-shadow: 1px 1px 1px #191817;
  -webkit-box-shadow: 1px 1px 1px #191817;
  -o-box-shadow: 1px 1px 1px #191817;
}
.description_contenu
{
  position: absolute;
  display: block;
  width: 391px;
  height: 91px;
  overflow: auto;
  background-color: #191817;
  font-size: 10px;
  color: #ffffff;
  text-align: justify;
  padding: 5px;
  opacity: 0;
  -moz-opacity: 0;
  -khtml-opacity: 0;
  filter: alpha(opacity=0);
  transform: all;
-moz-transform: all;
-o-transform: all;
-htm-transform: all;
-webkit-transform: all;
transition: 1s;
-moz-transition: 1s;
-o-transition: 1s;
-htm-transition: 1s;
-webkit-transition: 1s;
}
.description_contenu:hover
{
  opacity: 0.7;
  -moz-opacity: 0.7;
  -khtml-opacity: 0.7;
  filter: alpha(opacity=70);
  transform: all;
-moz-transform: all;
-o-transform: all;
-htm-transform: all;
-webkit-transform: all;
transition: 1s;
-moz-transition: 1s;
-o-transition: 1s;
-htm-transition: 1s;
-webkit-transition: 1s;
}
.icone_stats
{
  width: 300px;
  margin: auto;
  margin-top: -30px;
}
.stats_lastpost
{
  display: block;
  width: 160px;
  height: 80px;
  margin-left: 10px;
  background-color: transparent;
  border: 1px solid #b5b5b5;
  padding: 5px;
  text-align: center;
}
.stats
{
  display: block;
  margin-bottom: 5px;
  border-bottom: 1px dotted #b5b5b5;
  padding-bottom: 5px;
  font-size: 10px;
  color: #8f8f8f;
}
.lastpost
{
  display: block;
  font-size: 11px;
}
.sforum
{
  position: relative;
  z-index: 3;
  display: block;
  height: 0;
    background: #191817;
  color: #b5b5b5;
  overflow: hidden;
    transform: all;
-moz-transform: all;
-o-transform: all;
-htm-transform: all;
-webkit-transform: all;
transition: 1s;
-moz-transition: 1s;
-o-transition: 1s;
-htm-transition: 1s;
-webkit-transition: 1s;
}
.ouverture_sousforum
{
  position: relative;
  z-index: 3;
  display: block;
  float: right;
  width: 120px;
  margin-right: 20px;
  background: #191817;
  color: #b5b5b5;
  font-size: 11px;
  text-align: center;
  padding: 4px;
  -webkit-border-bottom-right-radius: 10px;
-webkit-border-bottom-left-radius: 10px;
-moz-border-radius-bottomright: 10px;
-moz-border-radius-bottomleft: 10px;
border-bottom-right-radius: 10px;
border-bottom-left-radius: 10px;
}
.sous_forum:hover .sforum
{
  height: 50px;
  background: #191817;
  color: #b5b5b5;
  padding: 4px;
  overflow: auto;
    transform: all;
-moz-transform: all;
-o-transform: all;
-htm-transform: all;
-webkit-transform: all;
transition: 1s;
-moz-transition: 1s;
-o-transition: 1s;
-htm-transition: 1s;
-webkit-transition: 1s;
}
.sous_forum a
{
  color: #ffffff !important;
  text-shadow: 1px 1px 0px #000000;
}
.sous_forum a:hover
{
  color: #B5DED0 !important;
}